1 /* Header for code translation functions
2 Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
3 Contributed by Paul Brook
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
25 /* Mangled symbols take the form __module__name. */
26 #define GFC_MAX_MANGLED_SYMBOL_LEN (GFC_MAX_SYMBOL_LEN*2+4)
28 /* Struct for holding a block of statements. It should be treated as an
29 opaque entity and not modified directly. This allows us to change the
30 underlying representation of statement lists. */
34 unsigned int has_scope
:1;
38 /* a simplified expression */
41 /* Code blocks to be executed before and after using the value. */
45 /* the result of the expression */
48 /* The length of a character string value. */
51 /* If set gfc_conv_variable will return an expression for the array
52 descriptor. When set, want_pointer should also be set.
53 If not set scalarizing variables will be substituted. */
54 unsigned descriptor_only
:1;
56 /* When this is set gfc_conv_expr returns the address of a variable. Only
57 applies to EXPR_VARIABLE nodes.
58 Also used by gfc_conv_array_parameter. When set this indicates a pointer
59 to the descriptor should be returned, rather than the descriptor itself.
61 unsigned want_pointer
:1;
63 /* An array function call returning without a temporary. Also used for array
64 pointer assignments. */
65 unsigned direct_byref
:1;
67 /* Ignore absent optional arguments. Used for some intrinsics. */
68 unsigned ignore_optional
:1;
70 /* Scalarization parameters. */
71 struct gfc_se
*parent
;
73 struct gfc_loopinfo
*loop
;
78 /* Scalarization State chain. Created by walking an expression tree before
79 creating the scalarization loops. Then passed as part of a gfc_se structure
80 to translate the expression inside the loop. Note that these chains are
81 terminated by gfc_se_terminator, not NULL. A NULL pointer in a gfc_se
82 indicates to gfc_conv_* that this is a scalar expression.
83 Note that some member arrays correspond to scalarizer rank and others
84 are the variable rank. */
86 typedef struct gfc_ss_info
89 /* The ref that holds information on this section. */
91 /* The descriptor of this array. */
93 /* holds the pointer to the data array. */
95 /* To move some of the array index calculation out of the innermost loop. */
99 /* Holds the SS for a subscript. Indexed by actual dimension. */
100 struct gfc_ss
*subscript
[GFC_MAX_DIMENSIONS
];
102 /* stride and delta are used to access this inside a scalarization loop.
103 start is used in the calculation of these. Indexed by scalarizer
105 tree start
[GFC_MAX_DIMENSIONS
];
106 tree stride
[GFC_MAX_DIMENSIONS
];
107 tree delta
[GFC_MAX_DIMENSIONS
];
109 /* Translation from scalarizer dimensions to actual dimensions.
110 actual = dim[scalarizer] */
111 int dim
[GFC_MAX_DIMENSIONS
];
117 /* A scalar value. This will be evaluated before entering the
118 scalarization loop. */
121 /* Like GFC_SS_SCALAR except it evaluates a pointer to the expression.
122 Used for elemental function parameters. */
125 /* An array section. Scalarization indices will be substituted during
126 expression translation. */
129 /* A non-elemental function call returning an array. The call is executed
130 before entering the scalarization loop, storing the result in a
131 temporary. This temporary is then used inside the scalarization loop.
132 Simple assignments, eg. a(:) = fn() are handles without a temporary
133 as a special case. */
136 /* An array constructor. The current implementation is sub-optimal in
137 many cases. It allocated a temporary, assigns the values to it, then
138 uses this temporary inside the scalarization loop. */
141 /* A vector subscript. The vector's descriptor is cached in the
142 "descriptor" field of the associated gfc_ss_info. */
145 /* A temporary array allocated by the scalarizer. Its rank can be less
146 than that of the assignment expression. */
149 /* An intrinsic function call. Many intrinsic functions which map directly
150 to library calls are created as GFC_SS_FUNCTION nodes. */
153 /* A component of a derived type. */
158 /* SS structures can only belong to a single loopinfo. They must be added
159 otherwise they will not get freed. */
160 typedef struct gfc_ss
168 /* If type is GFC_SS_SCALAR or GFC_SS_REFERENCE. */
178 /* The rank of the temporary. May be less than the rank of the
179 assigned expression. */
184 /* All other types. */
189 /* All the SS in a loop and linked through loop_chain. The SS for an
190 expression are linked by the next pointer. */
191 struct gfc_ss
*loop_chain
;
194 /* This is used by assignments requiring temporaries. The bits specify which
195 loops the terms appear in. This will be 1 for the RHS expressions,
196 2 for the LHS expressions, and 3(=1|2) for the temporary. */
200 #define gfc_get_ss() gfc_getmem(sizeof(gfc_ss))
202 /* The contents of this aren't actually used. A NULL SS chain indicates a
203 scalar expression, so this pointer is used to terminate SS chains. */
204 extern gfc_ss
* const gfc_ss_terminator
;
206 /* Holds information about an expression while it is being scalarized. */
207 typedef struct gfc_loopinfo
214 /* All the SS involved with this loop. */
216 /* The SS describing the temporary used in an assignment. */
219 /* The scalarization loop index variables. */
220 tree loopvar
[GFC_MAX_DIMENSIONS
];
222 /* The bounds of the scalarization loops. */
223 tree from
[GFC_MAX_DIMENSIONS
];
224 tree to
[GFC_MAX_DIMENSIONS
];
225 gfc_ss
*specloop
[GFC_MAX_DIMENSIONS
];
227 /* The code member contains the code for the body of the next outer loop. */
228 stmtblock_t code
[GFC_MAX_DIMENSIONS
];
230 /* Order in which the dimensions should be looped, innermost first. */
231 int order
[GFC_MAX_DIMENSIONS
];
233 /* The number of dimensions for which a temporary is used. */
236 /* If set we don't need the loop variables. */
237 unsigned array_parameter
:1;
242 /* Information about a symbol that has been shadowed by a temporary. */
245 symbol_attribute attr
;
251 /* Advance the SS chain to the next term. */
252 void gfc_advance_se_ss_chain (gfc_se
*);
254 /* Call this to initialize a gfc_se structure before use
255 first parameter is structure to initialize, second is
256 parent to get scalarization data from, or NULL. */
257 void gfc_init_se (gfc_se
*, gfc_se
*);
259 /* Create an artificial variable decl and add it to the current scope. */
260 tree
gfc_create_var (tree
, const char *);
261 /* Like above but doesn't add it to the current scope. */
262 tree
gfc_create_var_np (tree
, const char *);
264 /* Store the result of an expression in a temp variable so it can be used
265 repeatedly even if the original changes */
266 void gfc_make_safe_expr (gfc_se
* se
);
268 /* Makes sure se is suitable for passing as a function string parameter. */
269 void gfc_conv_string_parameter (gfc_se
* se
);
271 /* Add an item to the end of TREE_LIST. */
272 tree
gfc_chainon_list (tree
, tree
);
274 /* When using the gfc_conv_* make sure you understand what they do, i.e.
275 when a POST chain may be created, and what the returned expression may be
276 used for. Note that character strings have special handling. This
277 should not be a problem as most statements/operations only deal with
278 numeric/logical types. See the implementations in trans-expr.c
279 for details of the individual functions. */
281 void gfc_conv_expr (gfc_se
* se
, gfc_expr
* expr
);
282 void gfc_conv_expr_val (gfc_se
* se
, gfc_expr
* expr
);
283 void gfc_conv_expr_lhs (gfc_se
* se
, gfc_expr
* expr
);
284 void gfc_conv_expr_reference (gfc_se
* se
, gfc_expr
*);
285 void gfc_conv_expr_type (gfc_se
* se
, gfc_expr
*, tree
);
287 /* Find the decl containing the auxiliary variables for assigned variables. */
288 void gfc_conv_label_variable (gfc_se
* se
, gfc_expr
* expr
);
289 /* If the value is not constant, Create a temporary and copy the value. */
290 tree
gfc_evaluate_now (tree
, stmtblock_t
*);
292 /* Intrinsic function handling. */
293 void gfc_conv_intrinsic_function (gfc_se
*, gfc_expr
*);
295 /* Does an intrinsic map directly to an external library call. */
296 int gfc_is_intrinsic_libcall (gfc_expr
*);
298 /* Also used to CALL subroutines. */
299 int gfc_conv_function_call (gfc_se
*, gfc_symbol
*, gfc_actual_arglist
*);
300 /* gfc_trans_* shouldn't call push/poplevel, use gfc_push/pop_scope */
302 /* Generate code for a scalar assignment. */
303 tree
gfc_trans_scalar_assign (gfc_se
*, gfc_se
*, bt
);
305 /* Translate COMMON blocks. */
306 void gfc_trans_common (gfc_namespace
*);
308 /* Translate a derived type constructor. */
309 void gfc_conv_structure (gfc_se
*, gfc_expr
*, int);
311 /* Return an expression which determines if a dummy parameter is present. */
312 tree
gfc_conv_expr_present (gfc_symbol
*);
314 /* Generate code to allocate a string temporary. */
315 tree
gfc_conv_string_tmp (gfc_se
*, tree
, tree
);
316 /* Get the string length variable belonging to an expression. */
317 tree
gfc_get_expr_charlen (gfc_expr
*);
318 /* Initialize a string length variable. */
319 void gfc_trans_init_string_length (gfc_charlen
*, stmtblock_t
*);
321 /* Add an expression to the end of a block. */
322 void gfc_add_expr_to_block (stmtblock_t
*, tree
);
323 /* Add a block to the end of a block. */
324 void gfc_add_block_to_block (stmtblock_t
*, stmtblock_t
*);
325 /* Add a MODIFY_EXPR to a block. */
326 void gfc_add_modify_expr (stmtblock_t
*, tree
, tree
);
328 /* Initialize a statement block. */
329 void gfc_init_block (stmtblock_t
*);
330 /* Start a new statement block. Like gfc_init_block but also starts a new
332 void gfc_start_block (stmtblock_t
*);
333 /* Finish a statement block. Also closes the scope if the block was created
334 with gfc_start_block. */
335 tree
gfc_finish_block (stmtblock_t
*);
336 /* Merge the scope of a block with its parent. */
337 void gfc_merge_block_scope (stmtblock_t
* block
);
339 /* Return the backend label decl. */
340 tree
gfc_get_label_decl (gfc_st_label
*);
342 /* Return the decl for an external function. */
343 tree
gfc_get_extern_function_decl (gfc_symbol
*);
345 /* Return the decl for a function. */
346 tree
gfc_get_function_decl (gfc_symbol
*);
348 /* Build a CALL_EXPR. */
349 tree
gfc_build_function_call (tree
, tree
);
351 /* Build an ADDR_EXPR. */
352 tree
gfc_build_addr_expr (tree
, tree
);
354 /* Build an INDIRECT_REF. */
355 tree
gfc_build_indirect_ref (tree
);
357 /* Build an ARRAY_REF. */
358 tree
gfc_build_array_ref (tree
, tree
);
360 /* Creates a label. Decl is artificial if label_id == NULL_TREE. */
361 tree
gfc_build_label_decl (tree
);
363 /* Return the decl used to hold the function return value.
364 Do not use if the function has an explicit result variable. */
365 tree
gfc_get_fake_result_decl (gfc_symbol
*);
367 /* Get the return label for the current function. */
368 tree
gfc_get_return_label (void);
370 /* Add a decl to the binding level for the current function. */
371 void gfc_add_decl_to_function (tree
);
373 /* Make prototypes for runtime library functions. */
374 void gfc_build_builtin_function_decls (void);
376 /* Set the backend source location of a decl. */
377 void gfc_set_decl_location (tree
, locus
*);
379 /* Return the variable decl for a symbol. */
380 tree
gfc_get_symbol_decl (gfc_symbol
*);
382 /* Build a static initializer. */
383 tree
gfc_conv_initializer (gfc_expr
*, gfc_typespec
*, tree
, bool, bool);
385 /* Substitute a temporary variable in place of the real one. */
386 void gfc_shadow_sym (gfc_symbol
*, tree
, gfc_saved_var
*);
388 /* Restore the original variable. */
389 void gfc_restore_sym (gfc_symbol
*, gfc_saved_var
*);
391 /* Returns true if a variable of specified size should go on the stack. */
392 int gfc_can_put_var_on_stack (tree
);
394 /* Allocate the lang-specific part of a decl node. */
395 void gfc_allocate_lang_decl (tree
);
397 /* Advance along a TREE_CHAIN. */
398 tree
gfc_advance_chain (tree
, int);
400 /* Create a decl for a function. */
401 void gfc_create_function_decl (gfc_namespace
*);
402 /* Generate the code for a function. */
403 void gfc_generate_function_code (gfc_namespace
*);
404 /* Output a BLOCK DATA program unit. */
405 void gfc_generate_block_data (gfc_namespace
*);
406 /* Output a decl for a module variable. */
407 void gfc_generate_module_vars (gfc_namespace
*);
409 /* Get and set the current location. */
410 void gfc_set_backend_locus (locus
*);
411 void gfc_get_backend_locus (locus
*);
413 /* Handle static constructor functions. */
414 extern GTY(()) tree gfc_static_ctors
;
415 void gfc_generate_constructors (void);
417 /* Generate a runtime error check. */
418 void gfc_trans_runtime_check (tree
, tree
, stmtblock_t
*);
420 /* Generate code for an assignment, includes scalarization. */
421 tree
gfc_trans_assignment (gfc_expr
*, gfc_expr
*);
423 /* Generate code for a pointer assignment. */
424 tree
gfc_trans_pointer_assignment (gfc_expr
*, gfc_expr
*);
426 /* Initialize function decls for library functions. */
427 void gfc_build_intrinsic_lib_fndecls (void);
428 /* Create function decls for IO library functions. */
429 void gfc_build_io_library_fndecls (void);
430 /* Build a function decl for a library function. */
431 tree
gfc_build_library_function_decl (tree
, tree
, int, ...);
434 tree
pushdecl (tree
);
435 tree
pushdecl_top_level (tree
);
436 void pushlevel (int);
437 tree
poplevel (int, int, int);
438 tree
getdecls (void);
439 tree
gfc_truthvalue_conversion (tree
);
440 tree
builtin_function (const char *, tree
, int, enum built_in_class
,
443 /* Runtime library function decls. */
444 extern GTY(()) tree gfor_fndecl_internal_malloc
;
445 extern GTY(()) tree gfor_fndecl_internal_malloc64
;
446 extern GTY(()) tree gfor_fndecl_internal_realloc
;
447 extern GTY(()) tree gfor_fndecl_internal_realloc64
;
448 extern GTY(()) tree gfor_fndecl_internal_free
;
449 extern GTY(()) tree gfor_fndecl_allocate
;
450 extern GTY(()) tree gfor_fndecl_allocate64
;
451 extern GTY(()) tree gfor_fndecl_deallocate
;
452 extern GTY(()) tree gfor_fndecl_pause_numeric
;
453 extern GTY(()) tree gfor_fndecl_pause_string
;
454 extern GTY(()) tree gfor_fndecl_stop_numeric
;
455 extern GTY(()) tree gfor_fndecl_stop_string
;
456 extern GTY(()) tree gfor_fndecl_select_string
;
457 extern GTY(()) tree gfor_fndecl_runtime_error
;
458 extern GTY(()) tree gfor_fndecl_set_fpe
;
459 extern GTY(()) tree gfor_fndecl_set_std
;
460 extern GTY(()) tree gfor_fndecl_in_pack
;
461 extern GTY(()) tree gfor_fndecl_in_unpack
;
462 extern GTY(()) tree gfor_fndecl_associated
;
464 /* Math functions. Many other math functions are handled in
465 trans-intrinsic.c. */
467 typedef struct gfc_powdecl_list
GTY(())
475 extern GTY(()) gfc_powdecl_list gfor_fndecl_math_powi
[4][3];
476 extern GTY(()) tree gfor_fndecl_math_cpowf
;
477 extern GTY(()) tree gfor_fndecl_math_cpow
;
478 extern GTY(()) tree gfor_fndecl_math_cpowl10
;
479 extern GTY(()) tree gfor_fndecl_math_cpowl16
;
480 extern GTY(()) tree gfor_fndecl_math_ishftc4
;
481 extern GTY(()) tree gfor_fndecl_math_ishftc8
;
482 extern GTY(()) tree gfor_fndecl_math_ishftc16
;
483 extern GTY(()) tree gfor_fndecl_math_exponent4
;
484 extern GTY(()) tree gfor_fndecl_math_exponent8
;
485 extern GTY(()) tree gfor_fndecl_math_exponent10
;
486 extern GTY(()) tree gfor_fndecl_math_exponent16
;
488 /* String functions. */
489 extern GTY(()) tree gfor_fndecl_copy_string
;
490 extern GTY(()) tree gfor_fndecl_compare_string
;
491 extern GTY(()) tree gfor_fndecl_concat_string
;
492 extern GTY(()) tree gfor_fndecl_string_len_trim
;
493 extern GTY(()) tree gfor_fndecl_string_index
;
494 extern GTY(()) tree gfor_fndecl_string_scan
;
495 extern GTY(()) tree gfor_fndecl_string_verify
;
496 extern GTY(()) tree gfor_fndecl_string_trim
;
497 extern GTY(()) tree gfor_fndecl_string_repeat
;
498 extern GTY(()) tree gfor_fndecl_adjustl
;
499 extern GTY(()) tree gfor_fndecl_adjustr
;
501 /* Other misc. runtime library functions. */
502 extern GTY(()) tree gfor_fndecl_size0
;
503 extern GTY(()) tree gfor_fndecl_size1
;
504 extern GTY(()) tree gfor_fndecl_iargc
;
506 /* Implemented in FORTRAN. */
507 extern GTY(()) tree gfor_fndecl_si_kind
;
508 extern GTY(()) tree gfor_fndecl_sr_kind
;
511 /* True if node is an integer constant. */
512 #define INTEGER_CST_P(node) (TREE_CODE(node) == INTEGER_CST)
514 /* G95-specific declaration information. */
516 /* Array types only. */
517 struct lang_type
GTY(())
520 tree lbound
[GFC_MAX_DIMENSIONS
];
521 tree ubound
[GFC_MAX_DIMENSIONS
];
522 tree stride
[GFC_MAX_DIMENSIONS
];
529 struct lang_decl
GTY(())
531 /* Dummy variables. */
532 tree saved_descriptor
;
533 /* Assigned integer nodes. Stringlength is the IO format string's length.
534 Addr is the address of the string or the target label. Stringlength is
535 initialized to -2 and assigned to -1 when addr is assigned to the
536 address of target label. */
542 #define GFC_DECL_ASSIGN_ADDR(node) DECL_LANG_SPECIFIC(node)->addr
543 #define GFC_DECL_STRING_LEN(node) DECL_LANG_SPECIFIC(node)->stringlen
544 #define GFC_DECL_SAVED_DESCRIPTOR(node) \
545 (DECL_LANG_SPECIFIC(node)->saved_descriptor)
546 #define GFC_DECL_PACKED_ARRAY(node) DECL_LANG_FLAG_0(node)
547 #define GFC_DECL_PARTIAL_PACKED_ARRAY(node) DECL_LANG_FLAG_1(node)
548 #define GFC_DECL_ASSIGN(node) DECL_LANG_FLAG_2(node)
550 /* An array descriptor. */
551 #define GFC_DESCRIPTOR_TYPE_P(node) TYPE_LANG_FLAG_1(node)
552 /* An array without a descriptor. */
553 #define GFC_ARRAY_TYPE_P(node) TYPE_LANG_FLAG_2(node)
554 /* The GFC_TYPE_ARRAY_* members are present in both descriptor and
555 descriptorless array types. */
556 #define GFC_TYPE_ARRAY_LBOUND(node, dim) \
557 (TYPE_LANG_SPECIFIC(node)->lbound[dim])
558 #define GFC_TYPE_ARRAY_UBOUND(node, dim) \
559 (TYPE_LANG_SPECIFIC(node)->ubound[dim])
560 #define GFC_TYPE_ARRAY_STRIDE(node, dim) \
561 (TYPE_LANG_SPECIFIC(node)->stride[dim])
562 #define GFC_TYPE_ARRAY_RANK(node) (TYPE_LANG_SPECIFIC(node)->rank)
563 #define GFC_TYPE_ARRAY_SIZE(node) (TYPE_LANG_SPECIFIC(node)->size)
564 #define GFC_TYPE_ARRAY_OFFSET(node) (TYPE_LANG_SPECIFIC(node)->offset)
565 /* Code should use gfc_get_dtype instead of accesig this directly. It may
566 not be known when the type is created. */
567 #define GFC_TYPE_ARRAY_DTYPE(node) (TYPE_LANG_SPECIFIC(node)->dtype)
568 #define GFC_TYPE_ARRAY_DATAPTR_TYPE(node) \
569 (TYPE_LANG_SPECIFIC(node)->dataptr_type)
571 /* I changed this from sorry(...) because it should not return. */
572 /* TODO: Remove gfc_todo_error before releasing version 1.0. */
573 #define gfc_todo_error(args...) fatal_error("gfc_todo: Not Implemented: " args)
575 /* Build an expression with void type. */
576 #define build1_v(code, arg) build(code, void_type_node, arg)
577 #define build2_v(code, arg1, arg2) build2(code, void_type_node, \
579 #define build3_v(code, arg1, arg2, arg3) build3(code, void_type_node, \
582 /* This group of functions allows a caller to evaluate an expression from
583 the callee's interface. It establishes a mapping between the interface's
584 dummy arguments and the caller's actual arguments, then applies that
585 mapping to a given gfc_expr.
587 You can initialize a mapping structure like so:
589 gfc_interface_mapping mapping;
591 gfc_init_interface_mapping (&mapping);
593 You should then evaluate each actual argument into a temporary
594 gfc_se structure, here called "se", and map the result to the
595 dummy argument's symbol, here called "sym":
597 gfc_add_interface_mapping (&mapping, sym, &se);
599 After adding all mappings, you should call:
601 gfc_finish_interface_mapping (&mapping, pre, post);
603 where "pre" and "post" are statement blocks for initialization
604 and finalization code respectively. You can then evaluate an
605 interface expression "expr" as follows:
607 gfc_apply_interface_mapping (&mapping, se, expr);
609 Once you've evaluated all expressions, you should free
610 the mapping structure with:
612 gfc_free_interface_mapping (&mapping); */
615 /* This structure represents a mapping from OLD to NEW, where OLD is a
616 dummy argument symbol and NEW is a symbol that represents the value
617 of an actual argument. Mappings are linked together using NEXT
618 (in no particular order). */
619 typedef struct gfc_interface_sym_mapping
621 struct gfc_interface_sym_mapping
*next
;
625 gfc_interface_sym_mapping
;
628 /* This structure is used by callers to evaluate an expression from
629 a callee's interface. */
630 typedef struct gfc_interface_mapping
632 /* Maps the interface's dummy arguments to the values that the caller
633 is passing. The whole list is owned by this gfc_interface_mapping. */
634 gfc_interface_sym_mapping
*syms
;
636 /* A list of gfc_charlens that were needed when creating copies of
637 expressions. The whole list is owned by this gfc_interface_mapping. */
638 gfc_charlen
*charlens
;
640 gfc_interface_mapping
;
642 void gfc_init_interface_mapping (gfc_interface_mapping
*);
643 void gfc_free_interface_mapping (gfc_interface_mapping
*);
644 void gfc_add_interface_mapping (gfc_interface_mapping
*,
645 gfc_symbol
*, gfc_se
*);
646 void gfc_finish_interface_mapping (gfc_interface_mapping
*,
647 stmtblock_t
*, stmtblock_t
*);
648 void gfc_apply_interface_mapping (gfc_interface_mapping
*,
649 gfc_se
*, gfc_expr
*);
651 #endif /* GFC_TRANS_H */